* {
    /* border: 1px solid red; */
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    text-decoration: none;
    color: black;
}

li {
    list-style-type: none;
}

button {
    border: none;
}

.center {
    margin: 0 10%;
}

.flex {
    display: flex;
}

.white {
    background-color: #fefefe;
}

.gray {
    background-color: #f4f7f8;
}

.black {
    background-color: #1f2023;
}

header .center {
    height: 85px;
    display: flex;
    justify-content: space-between;
}

header .center .left {
    display: flex;
    flex-flow: column;
    justify-content: center;
}

header .center .right {
    display: flex;
    flex-flow: column;
    justify-content: center;
}

main{
    padding-top: 20px
}

main .nav {
    height: 70px;
    margin: 5px 0;
}

main .nav .nav_footer {
    height: 28px;
    display: flex;
    justify-content: space-between;
}

main .nav .nav_footer .nav_menu {
    width: 460px;
}

main .nav .nav_footer .nav_menu div {
    float: left;
    width: 16%;
    height: 100%;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    line-height: 28px;
    margin: 0 4px;
    cursor: pointer;
}

main .nav .nav_footer .nav_menu div:hover {
    border-bottom: 1px solid gray;
}

.nav_select {
    border-bottom: 1px solid gray;
}


main .ad {
    display: flex;
    justify-content: space-between;
    height: 250px;
    margin: 20px 0;
}

main .ad .left {
    position: relative;
    width: 48%;
    overflow: hidden;
}


main .ad .left .slider_container {
    position: absolute;
    height: 100%;
    width: 500%;
    overflow: hidden;
}

main .ad .left .slider_container li {
    float: left;
    width: 20%;
    height: 100%;
}

main .ad .left .slider_container li a {
    display: inline-block;
    width: 100%;
    height: 100%;
}

main .ad .left .slider_container li img {
    width: 100%;
    height: 100%;
}

main .ad .left .slider_controller #slider_controller_left {
    font-size: 23px;
    font-weight: 600;
    position: absolute;
    top: 48%;
    left: 0;
    cursor: pointer;

}

main .ad .left .slider_controller #slider_controller_right {
    font-size: 23px;
    font-weight: 600;
    position: absolute;
    top: 48%;
    right: 0;
    cursor: pointer;


}

main .ad .left .slider_point {
    position: absolute;
    bottom: 2px;
    left: 40%;
}
main .ad .left .slider_point span{
    display: inline-block;
    width: 0;
    height: 0;
    border: 4px solid #bec1c3;
    cursor: pointer;
}

main .ad .right {
    width: 48%;
    height: 248px;

}

main .ad .right .top {
    height: 38%;
    padding: 0 10%;
    border-bottom: 1px solid #eaeaeb;
    color: #4f5356;
    line-height: 38%;
}

main .ad .right .bottom {
    height: 70%;
    padding: 0 10%;
}

main .ad .right .bottom table {
    border-collapse: separate;
    border-spacing: 0px 15px;
}

main .graph {
    height: 320px;
    margin: 20px 0;

}

main .table {
    display: flex;
    justify-content: space-between;
    height: 350px;
    margin: 20px 0;
}

main .table .left {
    width: 48%;
    height: 100%;
}

main .table .right {
    width: 48%;
    height: 100%;

}

footer {
    height: 250px;
    padding: 50px 0;
    color: white;
}

footer .center {
    display: flex;
    justify-content: space-around;
}

footer .center .section ul li{
    margin: 10px 0;
}